| 1 | !!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 2 | !! LIM3 namelist: |
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| 3 | !! 1 - Generic parameters (namicerun) |
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| 4 | !! 2 - Diagnostics (namicediag) |
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| 5 | !! 3 - Ice initialization (namiceini) |
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| 6 | !! 4 - Ice discretization (namiceitd) |
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| 7 | !! 5 - Ice dynamics and transport (namicedyn) |
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| 8 | !! 6 - Ice diffusion (namicehdf) |
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| 9 | !! 7 - Ice thermodynamics (namicethd) |
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| 10 | !! 8 - Ice salinity (namicesal) |
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| 11 | !! 9 - Ice mechanical redistribution (namiceitdme) |
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| 12 | !!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 13 | ! |
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| 14 | !------------------------------------------------------------------------------ |
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| 15 | &namicerun ! Generic parameters |
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| 16 | !------------------------------------------------------------------------------ |
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| 17 | jpl = 5 ! number of ice categories |
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| 18 | nlay_i = 2 ! number of ice layers |
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| 19 | nlay_s = 1 ! number of snow layers (only 1 is working) |
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| 20 | rn_amax_n = 0.997 ! maximum tolerated ice concentration NH |
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| 21 | rn_amax_s = 0.997 ! maximum tolerated ice concentration SH |
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| 22 | cn_icerst_in = "restart_ice" ! suffix of ice restart name (input) |
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| 23 | cn_icerst_out = "restart_ice" ! suffix of ice restart name (output) |
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| 24 | cn_icerst_indir = "." ! directory to read input ice restarts |
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| 25 | cn_icerst_outdir = "." ! directory to write output ice restarts |
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| 26 | ln_limthd = .true. ! ice thermo (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
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| 27 | ln_limdyn = .true. ! ice dynamics (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
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| 28 | nn_limdyn = 2 ! (ln_limdyn=T) switch for ice dynamics |
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| 29 | ! 2: total |
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| 30 | ! 1: advection only (no diffusion, no ridging/rafting) |
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| 31 | ! 0: advection only (as 1 but with prescribed velocity, bypass rheology) |
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| 32 | rn_uice = 0.00001 ! (nn_limdyn=0) ice u-velocity |
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| 33 | rn_vice = -0.00001 ! (nn_limdyn=0) ice v-velocity |
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| 34 | / |
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| 35 | !------------------------------------------------------------------------------ |
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| 36 | &namicediag ! Diagnostics |
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| 37 | !------------------------------------------------------------------------------ |
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| 38 | ln_limdiachk = .false. ! check online the heat, mass & salt budgets (T) or not (F) |
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| 39 | ln_limdiahsb = .false. ! output the heat, mass & salt budgets (T) or not (F) |
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| 40 | ln_limctl = .false. ! ice points output for debug (T or F) |
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| 41 | iiceprt = 10 ! i-index for debug |
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| 42 | jiceprt = 10 ! j-index for debug |
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| 43 | / |
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| 44 | !------------------------------------------------------------------------------ |
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| 45 | &namiceini ! Ice initialization |
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| 46 | !------------------------------------------------------------------------------ |
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| 47 | ! -- limistate -- ! |
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| 48 | ln_limini = .false. ! activate ice initialization (T) or not (F) |
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| 49 | ln_limini_file = .false. ! netcdf file provided for initialization (T) or not (F) |
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| 50 | rn_thres_sst = 0.5 ! maximum water temperature with initial ice (degC) |
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| 51 | rn_hts_ini_n = 0.3 ! initial real snow thickness (m), North |
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| 52 | rn_hts_ini_s = 0.3 ! " " South |
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| 53 | rn_hti_ini_n = 3.0 ! initial real ice thickness (m), North |
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| 54 | rn_hti_ini_s = 1.0 ! " " South |
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| 55 | rn_ati_ini_n = 0.9 ! initial ice concentration (-), North |
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| 56 | rn_ati_ini_s = 0.9 ! " " South |
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| 57 | rn_smi_ini_n = 6.3 ! initial ice salinity (g/kg), North |
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| 58 | rn_smi_ini_s = 6.3 ! " " South |
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| 59 | rn_tmi_ini_n = 270. ! initial ice/snw temperature (K), North |
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| 60 | rn_tmi_ini_s = 270. ! " " South |
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| 61 | / |
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| 62 | !------------------------------------------------------------------------------ |
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| 63 | &namiceitd ! Ice discretization |
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| 64 | !------------------------------------------------------------------------------ |
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| 65 | nn_catbnd = 2 ! computation of ice category boundaries based on |
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| 66 | ! 1: tanh function |
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| 67 | ! 2: h^(-alpha), function of rn_himean |
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| 68 | rn_himean = 2.0 ! (nn_catbnd=2) expected domain-average ice thickness (m) |
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| 69 | / |
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| 70 | !------------------------------------------------------------------------------ |
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| 71 | &namicedyn ! Ice dynamics and transport |
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| 72 | !------------------------------------------------------------------------------ |
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| 73 | ! -- limtrp & limadv -- ! |
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| 74 | nn_limadv = 0 ! choose the advection scheme (-1=Prather ; 0=Ultimate-Macho) |
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| 75 | nn_limadv_ord = 5 ! choose the order of the advection scheme (if nn_limadv=0) |
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| 76 | ! -- limitd_me -- ! |
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| 77 | nn_icestr = 0 ! ice strength parameteriztaion |
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| 78 | ! 0: Hibler_79 P = pstar*<h>*exp(-c_rhg*A) |
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| 79 | ! 1: Rothrock_75 P = Cf*coeff*integral(wr.h^2) |
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| 80 | rn_pe_rdg = 17.0 ! (nn_icestr=1) ridging work divided by pot. energy change in ridging |
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| 81 | rn_pstar = 2.0e+04 ! (nn_icestr=0) ice strength thickness parameter (N/m2) |
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| 82 | rn_crhg = 20.0 ! (nn_icestr=0) ice strength conc. parameter (-) |
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| 83 | ln_icestr_bvf = .false. ! ice strength function brine volume (T) or not (F) |
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| 84 | ! |
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| 85 | ! -- limdyn & limrhg -- ! |
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| 86 | rn_cio = 5.0e-03 ! ice-ocean drag coefficient (-) |
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| 87 | rn_creepl = 1.0e-12 ! creep limit (s-1) |
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| 88 | rn_ecc = 2.0 ! eccentricity of the elliptical yield curve |
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| 89 | nn_nevp = 120 ! number of EVP subcycles |
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| 90 | rn_relast = 0.333 ! ratio of elastic timescale to ice time step: Telast = dt_ice * rn_relast |
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| 91 | ! advised value: 1/3 (rn_nevp=120) or 1/9 (rn_nevp=300) |
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| 92 | ln_landfast = .false. ! landfast ice parameterization (T or F) |
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| 93 | rn_gamma = 0.15 ! (ln_landfast=T) fraction of ocean depth that ice must reach to initiate landfast |
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| 94 | ! recommended range: [0.1 ; 0.25] |
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| 95 | rn_icebfr = 10. ! (ln_landfast=T) maximum bottom stress per unit area of contact (N/m2) |
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| 96 | ! a very large value ensures ice velocity=0 even with a small contact area |
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| 97 | ! recommended range: ?? (should be greater than atm-ice stress => >0.1 N/m2) |
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| 98 | rn_lfrelax = 1.e-5 ! (ln_landfast=T) relaxation time scale to reach static friction (s-1) |
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| 99 | / |
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| 100 | !------------------------------------------------------------------------------ |
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| 101 | &namicehdf ! Ice horizontal diffusion |
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| 102 | !------------------------------------------------------------------------------ |
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| 103 | ! -- limhdf -- ! |
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| 104 | nn_ahi0 = -1 ! horizontal diffusivity computation |
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| 105 | ! -1: no diffusion (bypass limhdf) |
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| 106 | ! 0: use rn_ahi0_ref |
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| 107 | ! 1: use rn_ahi0_ref x mean grid cell length / ( 2deg mean grid cell length ) |
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| 108 | ! 2: use rn_ahi0_ref x grid cell length / ( 2deg mean grid cell length ) |
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| 109 | rn_ahi0_ref = 350.0 ! horizontal sea ice diffusivity (m2/s) |
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| 110 | ! if nn_ahi0 > 0, rn_ahi0_ref is the reference value at a nominal 2 deg resolution |
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| 111 | / |
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| 112 | !------------------------------------------------------------------------------ |
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| 113 | &namicethd ! Ice thermodynamics |
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| 114 | !------------------------------------------------------------------------------ |
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| 115 | ! -- limthd_dif -- ! |
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| 116 | rn_kappa_i = 1.0 ! radiation attenuation coefficient in sea ice (m-1) |
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| 117 | nn_conv_dif = 50 ! maximal number of iterations for heat diffusion computation |
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| 118 | rn_terr_dif = 1.0e-04 ! maximum temperature after heat diffusion (degC) |
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| 119 | nn_ice_thcon = 1 ! sea ice thermal conductivity |
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| 120 | ! 0: k = k0 + beta.S/T (Untersteiner, 1964) |
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| 121 | ! 1: k = k0 + beta1.S/T - beta2.T (Pringle et al., 2007) |
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| 122 | ln_it_qnsice = .true. ! iterate the surface non-solar flux with surface temperature (T) or not (F) |
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| 123 | nn_monocat = 0 ! virtual ITD mono-category parameterizations (1, jpl = 1 only) or not (0) |
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| 124 | ! 2: simple piling instead of ridging --- temporary option |
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| 125 | ! 3: activate G(he) only --- temporary option |
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| 126 | ! 4: activate extra lateral melting only --- temporary option |
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| 127 | ! -- limthd_dh -- ! |
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| 128 | ln_limdH = .true. ! activate ice thickness change from growing/melting (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
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| 129 | rn_betas = 0.66 ! exponent in lead-ice repratition of snow precipitation |
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| 130 | ! betas = 1 -> equipartition, betas < 1 -> more on leads |
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| 131 | ! -- limthd_da -- ! |
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| 132 | ln_limdA = .true. ! activate lateral melting param. (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
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| 133 | rn_beta = 1.0 ! (ln_latmelt=T) coef. beta for lateral melting param. Recommended range=[0.8-1.2] |
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| 134 | ! => decrease = more melt and melt peaks toward higher concentration (A~0.5 for beta=1 ; A~0.8 for beta=0.2) |
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| 135 | ! 0.3 = best fit for western Fram Strait and Antarctica |
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| 136 | ! 1.4 = best fit for eastern Fram Strait |
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| 137 | rn_dmin = 8. ! (ln_latmelt=T) minimum floe diameter for lateral melting param. Recommended range=[6-10] |
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| 138 | ! => 6 vs 8m = +40% melting at the peak (A~0.5) |
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| 139 | ! 10 vs 8m = -20% melting |
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| 140 | ! -- limthd_lac -- ! |
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| 141 | ln_limdO = .true. ! activate ice growth in open-water (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
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| 142 | rn_hnewice = 0.1 ! thickness for new ice formation in open water (m) |
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| 143 | ln_frazil = .false. ! Frazil ice parameterization (ice collection as a function of wind) |
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| 144 | rn_maxfrazb = 1.0 ! (ln_frazil=T) maximum fraction of frazil ice collecting at the ice base |
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| 145 | rn_vfrazb = 0.417 ! (ln_frazil=T) thresold drift speed for frazil ice collecting at the ice bottom (m/s) |
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| 146 | rn_Cfrazb = 5.0 ! (ln_frazil=T) squeezing coefficient for frazil ice collecting at the ice bottom |
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| 147 | ! -- limitd_th -- ! |
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| 148 | rn_himin = 0.1 ! minimum ice thickness (m) used in remapping, must be smaller than rn_hnewice |
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| 149 | / |
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| 150 | !------------------------------------------------------------------------------ |
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| 151 | &namicesal ! Ice salinity |
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| 152 | !------------------------------------------------------------------------------ |
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| 153 | ! -- limthd_sal -- ! |
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| 154 | ln_limdS = .true. ! activate gravity drainage and flushing (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
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| 155 | nn_icesal = 2 ! ice salinity option |
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| 156 | ! 1: constant ice salinity (S=rn_icesal) |
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| 157 | ! 2: varying salinity parameterization S(z,t) |
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| 158 | ! 3: prescribed salinity profile S(z), Schwarzacher, 1959 |
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| 159 | rn_icesal = 4. ! (nn_icesal=1) ice salinity (g/kg) |
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| 160 | rn_sal_gd = 5. ! restoring ice salinity, gravity drainage (g/kg) |
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| 161 | rn_time_gd = 1.73e+6 ! restoring time scale, gravity drainage (s) |
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| 162 | rn_sal_fl = 2. ! restoring ice salinity, flushing (g/kg) |
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| 163 | rn_time_fl = 8.64e+5 ! restoring time scale, flushing (s) |
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| 164 | rn_simax = 20. ! maximum tolerated ice salinity (g/kg) |
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| 165 | rn_simin = 0.1 ! minimum tolerated ice salinity (g/kg) |
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| 166 | / |
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| 167 | !------------------------------------------------------------------------------ |
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| 168 | &namicemp ! Melt ponds |
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| 169 | !------------------------------------------------------------------------------ |
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| 170 | ! -- limmp -- ! |
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| 171 | ln_limMP = .true. ! activate melt ponds |
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| 172 | nn_limMP = 4 ! type of melt pond implementation (1=rad+fw,2=rad only, 3=fw only, 4=passive) |
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| 173 | / |
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| 174 | !------------------------------------------------------------------------------ |
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| 175 | &namiceitdme ! Ice mechanical redistribution (ridging and rafting) |
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| 176 | !------------------------------------------------------------------------------ |
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| 177 | ! -- limitd_me -- ! |
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| 178 | rn_cs = 0.5 ! fraction of shearing energy contributing to ridging |
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| 179 | nn_partfun = 1 ! type of ridging participation function |
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| 180 | ! 0: linear (Thorndike et al, 1975) |
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| 181 | ! 1: exponential (Lipscomb, 2007) |
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| 182 | rn_gstar = 0.15 ! (nn_partfun = 0) fractional area of thin ice being ridged |
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| 183 | rn_astar = 0.05 ! (nn_partfun = 1) exponential measure of ridging ice fraction |
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| 184 | ln_ridging = .true. ! ridging activated (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
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| 185 | rn_hstar = 100.0 ! (ln_ridging = T) determines the maximum thickness of ridged ice (m) (Hibler, 1980) |
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| 186 | rn_por_rdg = 0.3 ! (ln_ridging = T) porosity of newly ridged ice (Lepparanta et al., 1995) |
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| 187 | rn_fsnowrdg = 0.5 ! (ln_ridging = T) snow volume fraction that survives in ridging |
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| 188 | ln_rafting = .true. ! rafting activated (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
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| 189 | rn_hraft = 0.75 ! (ln_rafting = T) threshold thickness for rafting (m) |
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| 190 | rn_craft = 5.0 ! (ln_rafting = T) squeezing coefficient used in the rafting function |
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| 191 | rn_fsnowrft = 0.5 ! (ln_rafting = T) snow volume fraction that survives in rafting |
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| 192 | / |
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